*{
  margin: 0;padding: 0;list-style: none;box-sizing: border-box;
}
html,body,#root,.Hoems{
  width: 100%;height: 100%;
}
header{
  width: 100%;height: 30px;line-height: 30px;
  text-align: center;
}
main{
  flex: 1;
}
footer{
  width: 100%;
  height: 50px;
}